Aircon is not cold >Determine if it is producing cold
air

Fundamental Concept:
Cold Fan Coil + Strong Airflow = Cool Air

When your air conditioner is not cold, it can
either be that your Fan Coil is not cold or
the airflow is weak or both.
Therefore, it is important for you to know if
it will be a repair job or merely a servicing
job, or both.

Systematic Troubleshooting :

Step 1:

Turn on the air conditioner and make sure it
is set to the cool mode. Set the temperature
to the minimum and wait for
approximately 3 minutes, the compressor should
be running by now.

Step 2:

Climb higher so that you can put your hand
very near the aircon blower outlet. The outlet
temperature should measure
about 16'C when the room temperature is about
28'C. As the room cools down further, for
example, to 25'C, the blower
output temperature can be as cool as 12'C. If
possible, use a thermometer. With bare hands,
you may not be able tell
25'c from 28'c , but i think you should be
able to tell that difference between a 16'C
from a 28'C, right?